What makes CLOVER a unique communication system?

April 15, 2018


HAL Articles


What makes CLOVER a unique communication system?

The CLOVER digital communications mode is a truly unique communications system and an essential part of HF radio transmission, refined and improved over HAL Communications Corp’ five decades in operation. But what makes CLOVER HF protocol unique in its ability to improve communications?

What is CLOVER protocol?

HAL has a central spot in the history of CLOVER modems’ development. CLOVER protocol aids in transmitting digital data over high frequency waves, without the additional control characters required in other transmission, ultimately minimizing throughput. It does this by measuring transmission conditions and automatically re-modulating the waveform to match link quality. It also uses data encoding to repair errors during transmission, ensuring reliable communications in harsh conditions.

Data encoding in CLOVER modems eliminates errors in transmission.

Benefits of a CLOVER radio modem system

A high throughput and adaptive ARQ – Automatic Repeat Request (ARQ) protocols are generally restricted to one or two-rates – but with CLOVER, this is increased to six-rates. This means signal parameters for all radio transmissions are measured in real-time and waveform modulation is immediately set by the receiving station to the mode best suited. This means your communications are always optimised to the conditions and the HF equipment you’re using.

Bi-directional data transfer – Another unique benefit of the CLOVER system is the backwards and forwards transfer of data. While most ARQ protocols designed for HF radios are only able to transmit data in one direction at a time, CLOVER allows it to be sent and received simultaneously. The mode is designed to adjust itself to match the volumes moving in either direction. This has the dual advantage of maintaining a high level of transmission for written data, even in relatively poor communication conditions over HF radio.

CLOVER protocol allows bi-directional data transfer, opening the doors to quicker communication.

Error correction – CLOVER protocol incorporates error correction encoding of all transmitted and received data. Using the Reed-Solomon error correcting code algorithms, CLOVER corrects the errors made from noise bursts and deep selective fading when using high frequencies. To minimise waiting for communications to come through, CLOVER is designed to only require repeat transmission of data blocks where errors have exceeded the correction capacity of the Reed-Solomon coding.

These capabilities set CLOVER apart from other modem technology and make it a communications system uniquely suited to improving HF radio data transmission.

Developing a communications mode to improve data transfer in already dependable HF communications was part of HAL Communications Corp vision when they set out half a century ago. It is this ambition, and the hard work of our radio modem experts, that makes the CLOVER the unique data communications system it is today. Contact the team today for more information on our products.

Post by onchada